1 files changed, 61 insertions, 0 deletions
diff --git a/src/util.h b/src/util.h
index bd93b46b5..f9de909e9 100644
--- a/src/util.h
+++ b/src/util.h
@@ -353,4 +353,65 @@ GIT_INLINE(void) git__memzero(void *data, size_t size)
 #endif
 }
 
+#ifdef GIT_WIN32
+
+GIT_INLINE(double) git__timer(void)
+{
+	/* We need the initial tick count to detect if the tick
+	 * count has rolled over. */
+	static DWORD initial_tick_count = 0;
+
+	/* GetTickCount returns the number of milliseconds that have
+	 * elapsed since the system was started. */
+	DWORD count = GetTickCount();
+
+	if(initial_tick_count == 0) {
+		initial_tick_count = count;
+	} else if (count < initial_tick_count) {
+		/* The tick count has rolled over - adjust for it. */
+		count = (0xFFFFFFFF - initial_tick_count) + count;
+	}
+
+	return (double) count / (double) 1000;
+}
+
+#elif __APPLE__
+
+#include <mach/mach_time.h>
+
+GIT_INLINE(double) git__timer(void)
+{
+   uint64_t time = mach_absolute_time();
+   static double scaling_factor = 0;
+
+   if (scaling_factor == 0) {
+       mach_timebase_info_data_t info;
+       (void)mach_timebase_info(&info);
+       scaling_factor = (double)info.numer / (double)info.denom;
+   }
+
+   return (double)time * scaling_factor / 1.0E-9;
+}
+
+#else
+
+#include <sys/time.h>
+
+GIT_INLINE(double) git__timer(void)
+{
+	struct timespec tp;
+
+	if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
+		return (double) tp.tv_sec + (double) tp.tv_nsec / 1E-9;
+	} else {
+		/* Fall back to using gettimeofday */
+		struct timeval tv;
+		struct timezone tz;
+		gettimeofday(&tv, &tz);
+		return (double)tv.tv_sec + (double)tv.tv_usec / 1E-6;
+	}
+}
+
+#endif
+
 #endif /* INCLUDE_util_h__ */